Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Jeep > General Discussion
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools
Old 11-27-2017, 02:26 AM   #1
driftderive
AF Newbie
 
Join Date: Nov 2017
Location: Portland, Oregon
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Misfire in cylinder 4

2001 Jeep Grand Cherokee Laredo. 4.0 L
No problems for a year. Then misfire in cylinder 4 -P0304 and Injector 4 Control Circuit -P0204. Changed spark plugs -ran okay for a few weeks-still engine light on, changed ignition coil -found out spark plugs not tightened enough. Fixed that, ran well for less than a week. Check engine light back on. P0304. I don't have equipment to test the injector, so I assume the most economical option would be to go ahead and replace it. After that maybe a computer problem? I don't really understand car computers, but when the check engine light is on, it runs rough, so logically it cant be a sensor problem?
driftderive is offline   Reply With Quote
Old 11-27-2017, 03:41 AM   #2
harleyguy
AF Regular
 
Join Date: Apr 2016
Location: McPherson
Posts: 125
Thanks: 0
Thanked 10 Times in 10 Posts
Re: Misfire in cylinder 4

You have a while and more testing to do before you blame the computer. Swap the injector with a different cylinder and see if your miss moves.
harleyguy is offline   Reply With Quote
Old 11-29-2017, 09:59 AM   #3
rhandwor
AF Enthusiast
 
Join Date: Sep 2006
Location: Athens, Georgia
Posts: 4,662
Thanks: 0
Thanked 64 Times in 64 Posts
Re: Misfire in cylinder 4

If the swap doesn't work purchase a noid light at the parts store for your vehicle and check for pulse to injector.
http://www.ebay.com/itm/362164292284/www.ebay.com/ You only need the one for your vehicle.
rhandwor is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD

Go Back   Automotive Forums .com Car Chat > Jeep > General Discussion

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 01:42 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts